Issues regarding the flanges of heat exchanger linings
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It seems that the older model 151 doesn’t have a vacuum condition, so flanges cannot be used. The new 151 specifies that gasketed flanges cannot be used under vacuum conditions. Could someone with expertise explain why? Thank you.
Personally, I think it is due to considerations regarding the gasket flange sleeve. Since the liner has signal holes that connect it to the outside world, it will be sucked flat under vacuum conditions! ! Therefore, gasketed flanges are not recommended.
It is best not to use gasketed flanges.
For the tube sheets and vessel flanges of heat exchangers used in vacuum environments, it is still best to use stainless steel plates or forgings for their fabrication.
It is recommended to use with caution under vacuum conditions......
Can a gasketed flange be used in cases that are not completely vacuum? For example, a negative pressure of 0.02 MPa
Only on the heat exchanger? Can gasketed flanges be used in situations where there is negative pressure on containers and towers?
I am also looking into information on this topic. Nowadays, many low- and medium-pressure devices require vacuum conditions; if all of these devices were made using cladded materials or pure stainless steel, it would result in a significant increase in costs. Document 151 specifies the range of applications for which vacuum conditions and liner structures are suitable, but I could find no clear indication in documents 150 and 20592 that liner structures are not allowed to be used in vacuum conditions. I was wondering if any of you have come across any relevant information in other books or within these two documents? I hope everyone can exchange ideas together